We there are actually a number of versions of the Rede written by different people. We had a lengthy discussion about it here: http://www.spellsofmagic.com/read_post.html?post=621307

The Rede says "An it harm none, do as ye will." Understand here that Rede means advice, it is not a hard and fast law that one has to follow. I talked in depth about both the Rede and the Law of Three as the basis of Wiccan ethics here: http://www.spellsofmagic.com/read_post.html?post=477845